Psilocybin Mushroom

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There are dozens of species of psilocybin or 'magic mushrooms' belonging primarily to the genuses psilocybe, panaeolus, and copelandia. The effects of their ingestion resemble a shorter acting LSD (type of drug) trip, producing significant physical, visual, and perceptual changes.

Nearly all of the psilocybin containing mushrooms are small brown or tan mushrooms easily mistakable for any number of non-psychoactive, inedible, or poisonous mushrooms in the wild. This makes them somewhat difficult, and potentially hazardous, to identify. The primary distinguishable feature of most psilocybin containing mushrooms is that they bruise blue when handled.

In the beginning stages of onset, Mushrooms are likely to cause a sort of undefineable feeling similar to anticipation or anxiety. There may be a feeling of energy in the body, and the sense that things are different than usual. As the effects intensify, a wide variety of perceptual changes may occur; pupil dilation, visuals, mental stimulation, new perspectives, feelings of insight, quickly changing emotions (lots of laughter), possible paranoia and confusion. More advanced users may seek spiritual awareness or a sense of universal understanding through their use of mushrooms. Closed-eye visuals are extremely common with psilocybin mushrooms. Open-eye visuals are common for some people and are more likely at higher doses.

Many people experience nausea or vomiting during mushroom experiences, epecially with higher doses. Other possible negative effects include anxiety and unwanted or frightening thoughts and visions. Mushrooms, though perhaps to a lesser degree than LSD, can precipitate strong, temporary changes in an individual's experience of life and reality. It can be a powerful psychoactive experience, especially at higher doses, which is significantly affected by experiences, set and setting.  It is important to be prepared for the possibility of encountering difficult or frightening mental states.

http://www.erowid.org/plants/mushrooms/mushrooms_basics.shtml